References:
ROZANSKI, K., Consultants' group meeting on 14C reference materials for radiocarbon laboratories. February 18-20, 1991, Vienna, Austria. Internal Report, IAEA, Vienna (1991).
ROZANSKI, K., STICHLER, W., GONFIANTINI, R., SCOTT, E. M., BEUKENS, R. P., KROMER, B., VAN DER PLICHT, J., The IAEA 14C Intercomparison exercise 1990, Radiocarbon, 34 3 (1992) 506-519.